Update:
Fixed a few game-breaking bugs while this submission was under judgement. Apologies to all who were affected.

Update 2:
I'm getting a lot of feedback about the game being too hard. My intention was it to be challenging, although with only < 2% of players completing the game I guess I did overdo it. There's a small treat at the end of the tunnel, and those who get to see it should give themselves a pat on the back, seriously.

Way too difficult. There are too many enemies, they do too much damage, and you don't have enough health. Buying health upgrades doesn't even help, because you get 3 hearts back after dying no matter what your maximum health is. Strongly dislike.